I seen a dude trying to head my big truck tire yesterday at the tire shop and he used about a half a can of starting fluid and he never could get it to light because he would light a piece of paper towel on fire and then throw it at it while backing away because he was scared. I’m glad it didn’t light because I was like 😮 when I seen how much he used 😆 bout to blow everybody up
Make sure the gaps between your tire and your rim are not too big. My tire needed the straps to help widen it/close the gaps. You can try that as well. I also put some blocks of wood inside of it and let it sit for about a week to stretch it out as well then removed them when it was ready. That’s an option if you still can’t get it.
I had the valve in so air would not come out of the stem. I also had air pumping into the tire when I inflated because once the tire seats the air inside compresses so you need to feed it air to keep the bead